To me, in the other hand, this picture seems to show that there`s nothing necessarily "sluttish" in this sort of clothing. I mean, on the whole her attitude feels pretty natural to me. I hope it isn`t just me~

Very nifty. You might try some life drawing classes, her pose is a little unrealistic (or shes got some really bomb calves) and her face is a little out of proportion with her body. You show a really good talent for capturing an action pose. I can almost feel the fluidity of the movement shes in the middle of, not to mention shes adorable.